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Species
A group of organisms that can interbreed and produce fertile offspring
Population
A group of individual of the same species living in a specific area
Community
Different populations living and interacting in the same area
Ecosystem
A community and its abiotic environment
Habitat
The environment where a species normally lives
Niche
The role of an organism within its ecosystem, including its interactions and resource use
Biotic factors
Living components of an ecosystem (e.g. plants, animals, bacteria)
Abiotic factors
Non-living components of an ecosystem (e.g. temperature, water, sunlight)
Trophic level
A step int he food chain (e.g. producers, primary consumers, secondary consumers)
Food chain
A linear sequence showing energy flow through an ecosystem
Food web
A network of interconnected food chains
Bioaccumulation
The buildup of toxins in an individual organism
Biomagnification
The increasing concentration of toxins as they move up the food chain
Carrying capacity
The maximum population size an environment can support sustainably
Note 
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